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Apache FOP with Struts

Posted on 2004-08-19
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Hello Experts,
I'm trying to get my Struts Action class to generate a PDF response using Apache FOP.  I'm pretty new to FOP and not a Struts expert.  So far, what I've done in my Action class's execute() method is:

response.setContentType("application/pdf");
Driver driver = new Driver(new org.xml.sax.InputSource("foo.fo"), response.getOutputStream());
driver.setRenderer(Driver.RENDER_PDF);
driver.run();

This was taken pretty much straight from the FOP with Servlets example.
The exception I'm getting is:

java.lang.IllegalStateException: getOutputStream() has already been called for this response
      org.apache.coyote.tomcat5.CoyoteResponse.getWriter(CoyoteResponse.java:614)

I did expect to get an exception because I was just stabbing in the dark and wanted to see if I could get some kind of PDF output happening, but if anyone could either tell me whats wrong here or guide me in using FOP with Struts I'd be really grateful.

Cheers,
G.
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Question by:blackfrancis75
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Accepted Solution

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TimYates earned 500 total points
ID: 11841106
I'm not sure you can write to the response object in a struts action...

I always put stuff like that into a servlet, and redirect the request to point to that servlet
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Expert Comment

by:girionis
ID: 11841152
That's how we do it with Spring (where "app" is an object of type Appendix):

response.setContentType(<pdf content type>);
byte [] bytes = app.getFileContent();
response.setContentLength(bytes.length);
java.io.OutputStream os = response.getOutputStream();
os.write(bytes);
os.flush();
os.close();

and then we return null for the ModelAndView.

return null;

It should be more or less the same for struts.
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Author Comment

by:blackfrancis75
ID: 11848644
OK I've created a servlet that does the FOP stuff and I'm redirecting now from my Struts Action class to the Servlet, but doing so generates a 405 Error with the exception:

HTTP method POST is not supported by this URL

Any ideas about this one?
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LVL 5

Author Comment

by:blackfrancis75
ID: 11848737
Aha, I changed the doPost () servlet method to service() and now it works.

Thanks for the pointer Tim.
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